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EN
CASSETTE - FLOOR-CEILING - DUCTED UNITS
/ Installation Manual
7
14 PREPARATION FOR USE
14 PREPARATION FOR USE
This consists of the following steps:
• Checking for Leaks.
• Purging the installation.
• Start up.
• Troubleshooting.
14.1 CHECKING FOR LEAKS
Fig. 14.1 Checking for leaks in the installation.
Legend
1 Suction valve (gas)
Return valve (liquid)
Combined meter
4 Non-return joint
5 Pipes for refrigerant
6 Nitrogen cylinder
• Connect a combined meter (faucets) to the three-way valve
in the suction hose.
• Connect a nitrogen cylinder to the low-pressure end of the
combined meter.
• Carefully open the valves corresponding to the faucets and
pressurise the system.
• In the event of using R-410A refrigerant set it to 40 bar(g) of
pressure, for 10 min.
• Check that all the connections and joints are watertight.
• Close all the valves on the combined meter and remove the
nitrogen cylinder.
• Release the pressure from the system by slowly opening
the faucets.
• In the event of detecting leaks, repair them and repeat the
test.
NOTE!
According to Regulation 842/2006/EC, the complete
refrigerant circuit must be periodically checked for
leakage. Take the necessary actions to ensure these
tests are performed and the results correctly logged into
the maintenance record of the machine. The leakage
test must be done with the following frequency:
Systems with less than 3 kg of refrigerant => periodic
leakage test not needed
Systems with 3 kg or more of refrigerant => at least once
every 12 months
Systems with 30 kg or more of refrigerant => at least
once every 6 months
Systems with 300 kg or more of refrigerant => at least
once every 3 months.
14.2 PURGING THE INSTALLATION
Fig. 14.2 Purging the installation.
Legend
1 Suction valve (gas)
Return valve (liquid)
Combined meter
4 Non-return joint
5 Pipes for refrigerant
6 Vacuum pump for refrigerant
• Connect a combined meter (faucets) to the three-way valve
in the suction hose.
• Connect a vacuum pump to the low-pressure end of the
combined meter.
• Ensure that the faucets are closed.
• Turn the vacuum pump on and open the vacuum valve, the
low valve on the combined meter and the gas faucet.
• Ensure that the high valve is closed.
• Leave the vacuum pump functioning for approximately 15
minutes (depending on the size of the installation) to carry
out the vacuum.